R1#show run
hostname R1
ipv6
unicast-routing
interface FastEthernet0/0
ipv6 address 2020:AB8:2001::1010/64
ipv6
enable
standby version 2
standby 1 ipv6 autoconfig
standby 1 priority 120
standby 1 preempt delay minimum 30
standby 1 track Serial0/0 90
interface Serial0/0
ipv6 enable
ipv6 address 2010:AB8:2001::1010/64
end
R2#
show run
hostname R2
ipv6 unicast-routing
interface FastEthernet0/0
ipv6 address 2020:AB8:2001::1011/64
ipv6 enable
standby version 2
standby 1 ipv6 autoconfig
standby 1 preempt delay minimum 30
standby 1 track Serial0/0
interface Serial0/0
ipv6 address 2010:AB8:2010::1020/64
ipv6 enable
end